fix test resnet50 multi-threading on mkldnn

* fix nccl2 lars dist support

* put lars in momentum op

* add tests lars

* fix ci

* fix cpu kernel

* soft warning

* remove lars in test_recognize_digits.py

* move to another op

* add file

* update api.spec test=develop

* update test=develop

* fix api.spec test=develop

* wip

* wip, finish grad merge ops

* wip, finish graph build

* wip test running

* work on 1 gpu

* workable version

* update

* fix tests

* fuse broadcast op

* fix compile failed

* refine

* add batch merge test mnist

* fix CI test=develop

* fix build

* use independent bn params for batch merge test=develop

* update api.spec

* follow comments and for test

* wip

* refine tests test=develop

* follow comments test=develop

* remove startup bn modify test=develop

* follow comments test=develop

* fix merge test=develop

test=develop

delete unused codes.

Fix EditDistanceMetrics API bug

Merge branch 'shape_int_to_int64' of https://github.com/seiriosPlus/Paddle into cpu-for-1.1-merge-with-shape
test=develop

[1.1] Add hash_op implementation

[1.1] Accelerate sparse embedding grad op in CPU device

test=develop

test=develop

Merge branch 'optimize-sum-seq-pooling-op' of ssh://github.com/jacquesqiao/Paddle into cpu-for-1.1-merge

test=develop

test=develop

close UT about dist ctr, will fix it later
test=develop

Merge branch 'dist-table-do-not-init-on-trainer' of ssh://github.com/jacquesqiao/Paddle into cpu-for-1.1-merge

Merge branch 'add-flag-to-control-rpc-thread-num' of ssh://github.com/jacquesqiao/Paddle into cpu-for-1.1-merge

Merge branch 'fix_lookuptable_in_reduce' of https://github.com/seiriosPlus/Paddle into cpu-for-1.1-merge

* fix graph num hang test=develop

* re-enable tests test=develop

* re-enable graph num check test=develop

* fix multi device pass role check test=develop

test=develop

Refine detection mAP in metrics.py.

test=develop